Polarization-sensitive ultraviolet (UV) photodetection capable of detecting polarized UV light is highly indispensable in various fields, ranging from communication, near field imaging, as well as to remote sensing. However, it still remains elusive to achieve the self-powered devices, which can be operated in the absence of external bias.
In a study published in Angew.Chem.Int.Ed., a research group led by Prof. LUO Junhua from Fujian Institute of Research on the Structure of Matter(FJIRSM) of the Chinese Academy of Sciences demonstrated the first self-powered UV-polarized photodetector in a 2D wide-bandgap hybrid perovskite ferroelectric (BPA)2PbBr4 (BPA = 3-bromopropylammonium).
The researchers developed Self-powered photodetection with large on/off ratios (104) by integrating ferroelectricity into halide hybrid perovskite.
The ferroelectricity-driven self-powered photodetection shows impressive polarization-sensitivity towards linearly polarized UV illumination with an exceptionally high polarization ratio up to 6.8, which is greatly superior to that of previously reported UV-polarized photodetectors (e.g. ZnO, GaN and GeS2).
The strong polarization-sensitivity polarized UV illumination can be elucidated by the inherent light polarization dependence of bulk photovoltaic effect in (BPA)2PbBr4 (BPA = 3-bromopropylammonium).
This study provides a new opportunity to design self-powered UV-polarized photodetectors by integrating ferroelectricity into 2D hybrid perovskite in future.
A ferroelectricity-driven self-powered ultraviolet photodetector employing a 2D hybrid perovskite ferroelectric, which shows strong polarization-sensitivity. (Image by Prof. LUO's group)
Contact:
Prof. LUO Junhua
Fujian Institute of Research on the Structure of Matter
Chinese Academy of Sciences
Email: jhluo@fjirsm.ac.cn
